* {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
}

body {
    min-width: 1200px;
}

a {
    color: #afafaf;
    font-size: 12px;
}

.lf {
    float: left;
}

.rf {
    float: right;
}

.main {
    margin: auto;
    width: 1200px;
}

.flex {
    display: flex;
}

.flex-ja {
    justify-content: space-around;
}

.flex-jb {
    justify-content: space-between;
}

.flex-jc {
    justify-content: center;
}

.flex-ac {
    align-items: center;
}

.flex-je {
    justify-content: space-evenly;
}

.flex-w {
    flex-wrap: wrap;
}

.flex-dir {
    flex-direction: column;
}